The widget production project is well underway. The requirements are clear that each widget must weigh between 0.320 and 0.325 ounces. The first day of test production resulted in 1247 widgets. Of the widgets inspected, 47 percent fell within the acceptable weight range. This is an example of:

A.
Control limits.

B.
Quality assurance.

C.
Control charting.

D.
Corrective action.